Bobbin-carriage and bobbin of lace machinery.



W. B. MITCHELL. BOBBIN CARRIAGE AND BOBBIN OF LACE MACHINERY.

APPLICATION, IIL-BD SEPT. 6, 1910.

e a f Patented Jan. 23, 1912. I 2 SHEETS"-S?T 1.

W. B. MITCHELL. BOBBIN CARRIAGE AND BOBBIN 0F LACE MACHINERY.

APPLICATION FILED SEPT. 6, 1910.

Patented Jan. 23, 1912.

2 SHEETS-SHEET 2.

FIG 8 FIG 7 WILLIAM sauce MITCHELL, or EneB sTomBrRMINeHAM, ENGLAND,AssIeNofi ro WILLIAM MITCH-ELL (PENS) 'LIMI'IED, or SMETI-IWICK, NEAR;BIRMINGHAM,

' ENGLAND.

BOBBIN-UARRIAGEWAND BOBBIN or iiAcn-MAoHINEmE.

To all whom it may concern:

Be it known that 1, WILLIAM BRUCE; MITCHELL, a citizen of Great Britain,residing at 44 Portland road, Edgbaston, B1rmingham, county of Warwick;England,

managing "director, have invented. a certain new and useful lmprovementsin Bobbinthe working of the bobbin in the carriage,

remainsin principle the same.

Among the features which the various types ofoarriages have in common isan L opening which 1s substantially circular but provided at theinneredge of the lower.-half with a projecting portion or rib known asthe verge. This opening in the carriage is termed the cage and the'bObblIl; which is circular, 1s loosely retalned-inthis cage 1 byengaging onthe verge and by a retain ing spring'in the upper partengaging the bobbin by means of a shaped pro ection or nib and pressingit toward the verge.

The bobbins are commonly made with two disk like sides unitedby-rivetsftl1rough the center portion called the middle and re cessedfrom the peripheryof this middle to the perimeters of the disks toforman annular space to receive thethread. The'perimeters of the sidesare cut awaysufficiently on the inner side to form lips which do notmeet, and thus form an entrance or open way to the annular thread space,

so that the thread'may be woundinto the bobbin or removed therefrom.This space or way. "also forms the track portion by which the bobbinengages "the Verge 7 w of the carriage.

In all these known" constructions the lips of the bobbins have beenfaced square toward each other and parallel. 'To accomg modate these theverge of the carriage has necessarily been formed with parallel sidesand the carriage has been recessed on each side to form the verge ThereSpecification of Letters Patent Patented Jan. 23,1912. Application filedSeptember 6, 1910,. "Serial No. 580,61. Y

cessing leaves-square shoulders at the base of the verge on each otherside which receives the outer faces of the lips of thebobbln as thelatter turns in the cage and its openway between the lips covers and vloosely fits the verge. These well known their normal position thebobbins are placed forms are open to serious objections which v thepresent inventionisxdesigned to obviate; 7 Some of these objections areAs, the 1 bobblns. are wound;- and filled the sides are forced'apart andtobring the same back to; 5

under pressure, and in time the lips of the bobbin come in contact onewith the other.

Such bobbins are then extremely ,diificu-lt or altogethervimpossible towind, as. there is no way for the thread between the'" lips. If completecontact: of the lips has not taken place but they are partiallyclosed,-then=,as the bobbin is being unwound in use, the lips press sotightly on the verge and on the nib of the springthatgthe frictionbecomes (BX-I cessive and either causes frequent -breakage of the'threadorproduces bad fabric.'; The r lips of the bobbin "become damaged fromvar ous causes; and the bobbins are then :un-

usable as the slightest damage impedes or completely checks thenecessary running on the verge or the passage of the nib of the spring."7 e I The holding capacity of the bobbiridepends of course upon: thesize of the middle butin use',-as the thread is wound off the bobbinthespeed of the bobbin increases in proportion to-the amount of threadre- .p

moved; at the same time the pointwhere the F thread leaves the bobbincomes T" nearer the middle of the bobbin so that the decreased and anincreased tension must angle of pull or the leverage of the. pull" isthemiddle nust depend in practice on the 7 maximum tension that thethread can-"with- I stand, Hitherto there existed no means" ofaccommodating this tension. Bobbins of p the ordinary type (due to thefact thatjthe V a.

v lips are parallel) always present greatdiflicultiesin winding;as,thereis practically no lead or: guide tothethread; for these samereasons the-placing-ofthe bobbin in'posi} 'tion in the cage-ofthecarriage is extremely dilficuln andlikely to cause the bendin for orother damage to the. verge. ,Thevpresente type of verge is necessarilyvery delicate in formation and easily damaged, and as a verge cannot bereplaced considerable waste is thereby caused.

In accordance with the present invention I form the open way of thebobbin and the verge of the carriage and also preferably the nib of thespring so that the engaging port-ions of each are coacting inclines orcurves, so arranged that upon closing or partial closing of the lips ofthe'bobbin, these surfaces may still satisfactorily engage byautomatically altering their relative position. I may employ varioussections for the verge of the carriages and for the lips of the bobbinto present these antomatically adjusting inclines or curves, such as aconical section for the verge with the lips of the bobbin faced withcorre sponding inclines to ride on the sides of the verge; or I may makethe verge with convex sides in cross section or wit-h concave sides,correspondingly curving the surfaces of the lips so that they will coactwith the verge. It is preferred that the nib of the spring shouldcorrespond in form to the verge. I may in some instances remove theverge altogether and groove the carriage shaping the groove wedge likein cross section or with convex or concave sides; in these cases thelips of the bobbins are faced on their outer sides with inclines, convexor concave surfaces so as to work in the before mentioned relation withthe surfaces of'the groove in the carriage. In some cases by usingbobbins with their open ways formed in accordance with my invention Imay, by beveling the verge fit up old types of carriages with myinvention.

On the drawings: Figure 1 is an elevation showing one type of carriagewith a bobbin in place therein and with my invention applied. Fig. 2, isa section of the same on' line 22. Fig. 3, is an enlarged sectionshowing one example of the construction of the verge and the bobbinwhich is to ride upon it. Fig. 4, is a section of this construction butshowing a different working relation between the two parts. Fig. 5,shows a modified construct-ion in which coacting curves are used. Figs.6 and 7 show further modifications but in these one of the advantagesaimed at by my invention is not obtained. Fig. 8 shows my invention asit may be applied to old carriages by beveling the sidesof the parallelverge and providing bobbins made in accordance with the invention.

.On these drawings in the general views Figs. 1 and 2, a is a carriageof one particular type which is wellknown and serves here simply as anexample. The bobbin is represented by b and the opening or cage in thecarriage by the letter 0. The bobbin viously set forth it is with thebobbin in its relation to the verge and the nib of the retaining springthat my invention is concerned and I accordingly show these parts on alarger scale at Fig. 3. The verge f is formed as a cone in verticalsection, its sides presenting inclines h. h. The lips e of the bobbinare shaped so that the open way or track of the bobbin presents inclines2'. i. which correspond to those h, h, of the verge. The nib of theretaining spring which projects into the way or track of the bobbin soas to retain the latter properly on the verge is similarly shaped incross section as will be seen from Figs. 2 and 3 so that the bobbin andthe nib may smoothly cooperate even if the bobbin way or track ispartially closed.

As shown at Figs. 2 and 3 the verge is so formed that the bobbin takesits bearing on the inclined sides thereof; but as shown at Fig. 4 theverge is shorter and the peripheries of the lips of the bobbin may thenrest upon the shoulders k at each side.

At Fig. 5 the verge and the bobbin track are formed of correspondingcurves for the engaging surfaces in place of inclines. The nib of theretaining spring will correspond in cross section.

At Fig. 6 the verge as a projection is dispensed with and a recess isformed in its place in the carriage. The sides of this recess providethe inclines and the bobbin is provided with surfaces on its sides tocorrespond therewith. The accommodating relationship between the bobbinand its carriage is thus obtained.

Fig. 7 shows an arrangement similar to Fig. 6 but with coacting curvesinstead of inclines.

With both the forms seen at Figs. 6 and 7 only part of the advantageswhich are obtainable by my invention are secured.

As represented at Fig. 8 it is possible to adapt a carriage having anordinary verge for use with my invent-ion by beveling the top of theverge at each side. This will then accommodate a bobbin of my improvedtype but will not be so satisfactory in arrangement as a carriageconstructed fully in accordance with this invention.

From the construction shown at Figs. 1, 2, and 3, which is preferred andthe examples of modifications given in the latter figures the inventionwill be clearly comprehended. Now with the improved construction,suppose the bobbin lips to be closed or partially closed, the bobbin maystill work in the cage without undue friction, as owing to the formationof the engaging, Surfaces as "co-actmg lnchnes, or curves, the bobblnautomatically adyusts ltself to the vergeby rlsing slightly and theworking relation is not dis turbed. This is also the case with thenib-of the spring as the way of the bobbin and the nib may change theirrelative position riage, as the damaged part comes into con-' tacttherewlth and no undue frict on is caused. As the bobbin is unyvound thethread circle reduces in diameter and the speed of the bobbin andtension on the thread. increases; with my construction the bobbinaccommodates the increased tension by eas ing itself on the verge andreducing friction, thus the tension is reduced to a normal strain, andbreakage ofthe threadprevented; also this enables smaller middles to beused and consequently increases the holding capacity of the bobbin.Owing to thisimproved construction the verge is stronger as it isthicker atthe base; it may in fact gradus ally taper into the actualthickness of the carriage; thus the present danger of damage to theverge e ther wh1le-1n actual use,

or when the bobbin is separated from its carriage, or when they arebeing assembled again, is eliminated. Further the-improved constructiongives greater durability to the engaging parts of abobbin carriage andits bobbin. In the cases where the bobbin lips are shaped With conicalor curved. ways j the outer portion is always wider than the inner partand consequently if by'pressure' the lips are closed, it is the innerparts which meet and the outer are left open, thus always leaving aguide or way for the thread It is thus always possible to Wind thebobbin and moreover owing to this guiding provision for the thread,winding is much more easily and quickly performed. Further, 'owingtothis construction, bobbins are more easily mounted in the carriage sothat, apart from the verge belng stronger to reslst damage,

the latter is less likely to accrue to itowing to this greater ease ofinsertion. I may with my improved construction of the verge, radius orincline each end so that from the 1s provided and all shoulders areavoided.

With this invention carried out as set forth at Figs. 1, 2, and .3, Ifind the cars is no need to recess out the carriage to sharp squareangles at the sldes of the verge as 1s that the tools used in themanufacture {last many times as long as hitherto. I What I claim anddesire to secure by Letters Patentthen is: 1. In bobbin carriages andbobbins, a c'arruns, a verge? within said cage, a bobbin having a threadslot between peripheral means of said lips, and a retaining spring tionon said verge, the engaging portions of said bobbin and said verge being,co- 'aoting inclines which upon partial closing ,of the lips ofsaidbobbin automatically alter their relative position so that asatisfactory engagement still takes place. i

2. Inibobbin carriages and bobbins a care 'riage having a cage inwhichthe bobbin runs, a verge within said cage,abobbin having a thread slotbetween peripheral lips, said bobbin engaging said verge by means ofsaid lips, and a retaining spring holding said bobbin in proper workingposition on ;said verge by means of anib, the engaging portions of saidbobbin and said verge and said nib of the retaining spring being co- 3.In .bobbin carriages and bobbins car riage having a cage inwhich'thebobbin runs, a recess in said carriage for a portion oftheextent of said cage, bobbin having a-thread slot and inturnedlips, saidbobbin thereof, .the engaging surfaces of said car holding said bobbinin place, substantially as described.

signature in presence of two witnesses.

7 WILLIAM BRUCE MITCHELL.

Witnesses: V i i F1 GIL ERT BRE'ITELL,

SIMs BRETTELL.

Copies '01. this patent may be obtained for five cents each, byaddressing the Gommissionerof Patents Washi ngton, IL'G. is

riage is less costly in manufacture as there acting inclines as setforth.

riage. and said, bobbin being formed as co-. ,actmg lnclines, andretalnlng means for In testimony whereof I have affixed my 1 open partof the cage 0 alead onto the'verge done'with theold parallelconstruction so I riage" having a cage in which the bobbin lips, saidbobbin engaging said verge by holding said bobbin in proper working-posiv working in the recess in said carriage, the outer sldes of its llpsengaging the walls,

